Jackfanny
a brain-dead human who acts like they're the king of the hill
My cousin thinks he's a king because he can do 10 push-ups. He can't do 5 without crying.
My brother thinks he's a genius because he can count to 10. He can't count to 3 without messing up.
My friend thinks he's a genius because he can remember his own name. He can't remember his own birthday.